if_fddi.h

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/*
 * INET     An implementation of the TCP/IP protocol suite for the LINUX
 *      operating system.  INET is implemented using the BSD Socket
 *      interface as the means of communication with the user level.
 *
 *      Global definitions for the ANSI FDDI interface.
 *
 * Version: @(#)if_fddi.h   1.0.2   Sep 29 2004
 *
 * Author:  Lawrence V. Stefani, <[email protected]>
 *
 *      if_fddi.h is based on previous if_ether.h and if_tr.h work by
 *          Fred N. van Kempen, <[email protected]>
 *          Donald Becker, <[email protected]>
 *          Alan Cox, <[email protected]>
 *          Steve Whitehouse, <[email protected]>
 *          Peter De Schrijver, <[email protected]>
 *
 *      This program is free software; you can redistribute it and/or
 *      modify it under the terms of the GNU General Public License
 *      as published by the Free Software Foundation; either version
 *      2 of the License, or (at your option) any later version.
 */
#ifndef _UAPI_LINUX_IF_FDDI_H
#define _UAPI_LINUX_IF_FDDI_H

#include <linux/types.h>

/*
 *  Define max and min legal sizes.  The frame sizes do not include
 *  4 byte FCS/CRC (frame check sequence).
 */
#define FDDI_K_ALEN         6       /* Octets in one FDDI address */
#define FDDI_K_8022_HLEN    16      /* Total octets in 802.2 header */
#define FDDI_K_SNAP_HLEN    21      /* Total octets in 802.2 SNAP header */
#define FDDI_K_8022_ZLEN    16      /* Min octets in 802.2 frame sans FCS */
#define FDDI_K_SNAP_ZLEN    21      /* Min octets in 802.2 SNAP frame sans FCS */
#define FDDI_K_8022_DLEN    4475    /* Max octets in 802.2 payload */
#define FDDI_K_SNAP_DLEN    4470    /* Max octets in 802.2 SNAP payload */
#define FDDI_K_LLC_ZLEN     13      /* Min octets in LLC frame sans FCS */
#define FDDI_K_LLC_LEN      4491    /* Max octets in LLC frame sans FCS */

/* Define FDDI Frame Control (FC) Byte values */
#define FDDI_FC_K_VOID                  0x00    
#define FDDI_FC_K_NON_RESTRICTED_TOKEN  0x80    
#define FDDI_FC_K_RESTRICTED_TOKEN      0xC0    
#define FDDI_FC_K_SMT_MIN               0x41
#define FDDI_FC_K_SMT_MAX               0x4F
#define FDDI_FC_K_MAC_MIN               0xC1
#define FDDI_FC_K_MAC_MAX               0xCF    
#define FDDI_FC_K_ASYNC_LLC_MIN         0x50
#define FDDI_FC_K_ASYNC_LLC_DEF         0x54
#define FDDI_FC_K_ASYNC_LLC_MAX         0x5F
#define FDDI_FC_K_SYNC_LLC_MIN          0xD0
#define FDDI_FC_K_SYNC_LLC_MAX          0xD7
#define FDDI_FC_K_IMPLEMENTOR_MIN       0x60
#define FDDI_FC_K_IMPLEMENTOR_MAX       0x6F
#define FDDI_FC_K_RESERVED_MIN          0x70
#define FDDI_FC_K_RESERVED_MAX          0x7F

/* Define LLC and SNAP constants */
#define FDDI_EXTENDED_SAP   0xAA
#define FDDI_UI_CMD         0x03

/* Define 802.2 Type 1 header */
struct fddi_8022_1_hdr {
    __u8    dsap;                   /* destination service access point */
    __u8    ssap;                   /* source service access point */
    __u8    ctrl;                   /* control byte #1 */
} __attribute__((packed));

/* Define 802.2 Type 2 header */
struct fddi_8022_2_hdr {
    __u8    dsap;                   /* destination service access point */
    __u8    ssap;                   /* source service access point */
    __u8    ctrl_1;                 /* control byte #1 */
    __u8    ctrl_2;                 /* control byte #2 */
} __attribute__((packed));

/* Define 802.2 SNAP header */
#define FDDI_K_OUI_LEN  3
struct fddi_snap_hdr {
    __u8    dsap;                   /* always 0xAA */
    __u8    ssap;                   /* always 0xAA */
    __u8    ctrl;                   /* always 0x03 */
    __u8    oui[FDDI_K_OUI_LEN];    /* organizational universal id */
    __be16  ethertype;              /* packet type ID field */
} __attribute__((packed));

/* Define FDDI LLC frame header */
struct fddihdr {
    __u8    fc;                     /* frame control */
    __u8    daddr[FDDI_K_ALEN];     /* destination address */
    __u8    saddr[FDDI_K_ALEN];     /* source address */
    union
        {
        struct fddi_8022_1_hdr      llc_8022_1;
        struct fddi_8022_2_hdr      llc_8022_2;
        struct fddi_snap_hdr        llc_snap;
        } hdr;
} __attribute__((packed));


#endif /* _UAPI_LINUX_IF_FDDI_H */